﻿using System;
using System.Collections.Generic;
using System.Text;

namespace _017_字段_属性_索引器_常量_6_
{
    internal class Program
    {
        static void Main(string[] args)
        {
            const int x = 100;
            //x = 200;
        }

        static double GetArea(double r)
        {
            double area = Math.PI*r*r;
            return area;
        }
    }
}
